So Bayer is in Ph2 with fluoro-sorafenibaka DAST, BAY-734506… Only this time they’re in without Onyx and I gather Onyx is none too happy about this.

The distinct compound is claimed in WO/2005/009961 and the I believe the original Sorafenib app is: WO/2000/042012. What strikes the chemist inventor about a structure like this isn’t usually about who owns it, but if it can really be considered a new invention? The claim structure in the 2000 Sorafenib application can be schematized:

So for the purpose of this discussion the only meaningful definition is the ring designated as “L” and whether or not they claim the fluoride:

Anyhow while this structure and their priority date may be vulnerable to obviousness, all of these applications are assigned to Bayer, and not Onyx, so that disagreement will more likely be resolved based on the wording of the Onyx / Bayer contract. The Onyx press release suggests this very structure was discovered during the collaboration… We’ll see. Given the timing I bet someone saw the structure here on Kinasepro and told Onyx, heh.